Patents
Five patents in homomorphic encryption and privacy-preserving computation, filed during my tenure at the Commissariat à l’Énergie Atomique (CEA).
Method for Multi-User Confidential Querying of the Presence of a Record in a Database
A method enabling multiple users to securely query encrypted databases without revealing search queries or results to the server, combining stream cipher masking with additive homomorphic encryption and Private Information Retrieval protocols.
Inventors: Aymen Boudguiga, Renaud Sirdey, Oana Stan, Martin Zuber — Assignee: CEA
Filed: 2023-04-10 — Granted: 2025-05-27
Patent No: US12314270B2
Conditional Authentication Access Control Method
A method for controlling access to physical or logical resources through authentication that activates only when specified conditions are satisfied, using fully homomorphic encryption and keystream masking to protect biometric references while allowing verification in encrypted form.
Inventors: Renaud Sirdey, Aymen Boudguiga, Martin Zuber — Assignee: CEA
Filed: 2023-09-01 — Published: 2024-03-07 — Status: Pending
Patent No: US20240080202A1
Data Processing Method
A secure distributed data processing method using a server and a Trusted Execution Environment (TEE), where operations are performed on encrypted data using two complementary encryption schemes that prevent the server from deciphering data while protecting against honest-but-curious TEE behavior.
Inventors: Aymen Boudguiga, Renaud Sirdey, Oana Stan, Martin Zuber, Marc Renard — Assignee: CEA
Filed: 2023-12-21 — Published: 2025-06-27 — Status: Pending
Patent No: FR3157599A1
Method of Confidentially Querying a Database
A method for confidential database interrogation using hash functions, fully homomorphic encryption (FHE), and private information retrieval (PIR) to structure databases into collision classes, enabling secure searches on encrypted records.
Inventors: Renaud Sirdey, Aymen Boudguiga, Martin Zuber, Oana Stan — Assignee: CEA
Filed: 2023-08-02 — Published: 2025-02-07 — Status: Pending
Patent No: FR3151957A1 — PCT: WO2025027253A1
Anti-Collusion Client-Server Method and System for Homomorphically Encrypted Data
A system protecting against collusion between entities in cloud computing by deploying hardware security modules (HSMs) that exclusively control access to homomorphic cryptosystem private keys, preventing unauthorized decryption during remote computation delegation.
Inventors: Renaud Sirdey, Aymen Boudguiga, Martin Zuber — Assignee: CEA
Filed: 2023-12-26 — Published: 2025-11-05 — Status: Pending
Patent No: EP4643490A1